Heat-treating furnace



Fgh. 2 19626.-

H. HALVORSEN HEAT TREATING FURNACE Filed June 30, 1924 ""nl luw 1,1 'l.

7' ll 32 7 I INVENTOR. He n U fid-uonsen I v v ATTORNEY.

Patented Feb. 2, 1926.

HENRY HALVORSEN, OF DETROIT, MICHIGAN.

HEAT-TREATING FURNACE.

Application filed June 30, 1.924 Serial No. 723,264.

To all 1071 am it may concern Be it known that I, HENRY I-IALvonsnN, a citizen of the United States, residing at Detroit, in the county of Wayne and State of Michigan, have invented a new and useful Improvement in a Heat-Treating Furnace, of which the following is a specification.

My invention relates to a new and useful improvement in a heat-treating furnace adapted for heat-treating low carbon steel, high-speed steel, and also adapted for preheating preliminarily to the heat-treating process. provide a single furnace which may be used for heat-treating low, carbon isteel, heattreating high-speed steel, and for pre-heating purposes, without necessitating the employment of auxiliary burners, or the erection or constructhm of any extra equipment for utilizing the furnace for either of said purposes.

Another object of the invention is the provision of a heat-treating furnace which may be used for heat-treating at the same time of low carbon steel and higlrspeed steel.

Other objects will appear hereinafter.

The invention consists in the combinations and arrangements of parts hereinafter described and claimed.

The invention will be best understood from a reference to the accompanying drawings which form a part of this specification and in which,

Fig. 1 is a front elevational view of the invention,

Fig. 2 is a sectional view taken substantially on line 22 of Fig. 1,

Fig. 3 is a sectional view taken substantially on line 3-3 of Fig. 1,

Fig. 4 is a fragmentary sectional view taken substantially on line t4 of Fig. 1.

In the present invention I have constructed a heat-treating furnace having a pair of chambers heated by the same set of heating elements and so arranged that one of the chambers will be maintained normally at a higher temperature than the other. The construction and arrangement of the burners is such that normally the lower c0mpartment, or chamber, will be maintained at a sufficiently high temperature for heattreating high-speed steel, while the upper will be maintained from the same source of heat at the proper temperature for heat- An object of the invention is totreating low carbon steel. As will appear, as the description proceeds, if the device is desired for use for heat treating low carbon steel, alone, the lower chamber may be used for this purpose, in which case the burners would be regulated to admit the proper amount of heat. Under such circumstances, the lower chamber may be used for forcing low carbon steel, while the upper chamber would be used for pie-heating purposes.

The invention, in its preferred form, is provided with a base 9 having supporting standards or legs 10 and 11. Mounted on the base 9 is a frame suitably insulated with firebrick 1G, or other suitable non-conducting material. The housing, thus provided, has extended through it, so as to divide it into a pair of chambers 11 and 12, a centrally disposed wall 13 formed from suitable tirebrick, or other fire resisting material. As shown in Fig. 3, this wall has a forwardly extending portion 14 which projects beyond the front wall .15 of the housing. Formed in the side walls of the housing, in the lower chamber 12, are recesses 16 into which project nozzles 17, which are mounted on the feed pipes 18 positioned at opposite sides of the housing. Delivery pipes 19 and 19 connect with these feed pipes and'serve to conduct a suitable fuel, such as gas, to. the lower chamber for heating purposes. Suitable flues 36 communicate the upper chamber 11 with the lower chamber 12 so that the heat delivered to 0 the lower chamber 12 is permitted to heat the upper chamber 11. It is apparent that because the heat is delivered into the lower chamlier 12 and there first applied, the temperature of this chamber will ordinarily be higher than the temperature of the chamber 11. consequently, when the fuel. is delivered to the chamber 12 and the heat applied. so to raise the temperature of this chamber to the necessary point for treating highspeed steel, the temperature of the chamber 11 will be the proper temperature for heat-treating low carbon steel. This may be determined by the amount of heat applied to the chamber 12 and by the rela- 105 tive size of the two chambers. As shown in Fig. 3, the upper chamber is slightly larger than the lower chamber to permit of the dual use of the furnace. The upper chamber is provided with an opening 20 which is closed by a suitable door 21, having a cord 22 attached thereto and passed over suitable pulleys 23 and 24 mounted 011 a standard 25 which is mounted on the shell. A counterweight 26 is attached to the cord to render more easy the movement of the door 21. Suitable guide members 27 and 28 engage the door 21, said guide members being riveted or otherwise attached to the shell of the housing. Mounted on the forward side of the housing is a strip of metal 29 having one portion 30 angularly turned to lie in a horizontal plane to serve as an abutment for the sliding door 21. It is to be noted from Fig. 3 that the door 2i is suitably fireproofed on the inner side and that the plate 30 lies in engagement with the upper surface of the outwardly projecting portion I l. The door 21 is provided with a suitable opening 21' through which the operator may look into the interior of the furnace, when desired. The lower chamber 12 is also provided with a sliding door 31 having an opening 31 formed therein for purposes of inspection. Mounted upon the forward wall of the shell is a guide strip 32 which serves to guide the door 31 in its slideable movement. This strip 32 as shown in Fig. 4 is angularly turned at 33 having a further angularly turned portion 34. through which a rivet or other suitable fastening means may be projected. This arrangement of attaching the guide bar 32 to the wall of the furnace is similar at both ends. The member 32 is angularly turned at one edge between its ends to provide a base 35 upon which the lower edge of the door 31 may rest. As shownin Fig. 4, there is between the inner edge of the base 35 and the front wall of the housing a space 36 through which dust, dirt and other foreign material may drop so as to maintain the guide channel free for easy and rapid movement of the door 31, when desired. As shown in Fig. 4., the channel in which the door 31 engages is narrowed over the opening 37 as at 38 so that when the door moves into operative position, the member 32 serves to bind it closelyinto engagement with the forward wall of the housing.

In Fig. 2. I have shown deflecting blocks 39 in dotted lines which may be positioned in front of the nozzle 17 so as to deflect the flame and give a more universal distribution over the chamber.

The projection 14 serves to protect the plate 30 from injury with the heat escaping through the opening in the door 31, so as to give greater length of life to this plate.

Vhile I have illustrated and described the preferred form of structure, I do not wish to limit myself to the precise form of structure shown but desire to avail myself of such variations and modifications as come within the scope of the appended claims.

Having thus described my invention,

housing; a horizontally extending partition mounted in said housing for dividing thesame into a pair of chambers, said partition projecting exteriorly of and beyond the for ward wall of said housing and the lower of said chambers being smaller than the upper of said chambers; and means for heating said chambers, said heating means being adapted to direct the heat inward into the lower of said chambers, said chambers communicating through flues.

2. A heat-treating furnace comprising a housing; a horizontally extending partition for dividing said housing into a pair of chambers, the lower of said chambers being smaller than the upper and said partition projecting beyond the forward wall of said housing, each of said chambers being provided with an opening for permitting the deposit of articles in said chambers; a sliding closure for each of said openings, the closure for said lower chamber opening being adapted to engage along its upper edge the under-surface of said projecting portion of said partition; and means engageable along the lower edge of said closure for moving the closure of said lower chamher into close engagement with the forward wall of said housing when said closure is moved into closing position.

3. A heat-treating furnace comprising a housing having an opening formed therein; a slidably mounted closure for said opening; a guide member adapted to engage said closure along the lower edge, said guide member being angularly shaped and adapted to engage the undersurface and the outer surface of said door, said undersurface engaging portion being spaced slightly from 116 forward wall of said housing.

4. A heat-treating furnace comprising a housing; a horizontally extending partition mounted in said housing and adapted for dividing the same into a pair of compartmerits, said partition projecting beyond the forward wall of said housing, a suitable opening being provided in the forward wall of said housing for communicating with the upper of said chambers; a vertically mounted closure for said opening; guide members for engaging said closure in its vertical movements; a strap mounted on the forward wall of said housing and angularly turned intermediate its ends for lying in a horizontal plane, said horizontally lying portion eing adapted to engage the upper surface of said projecting portion of said partition and for engaging the lower edge of said closure when said closure is moved to operative position.

5. A heat-treating furnace comprising a housing having a pair of compartments formed therein, one above the other, each of said compartments having an opening formed in the forward end thereof; a closure for each of said openings; a guide member adapted for engaging the lower portion of said closure of the lower compartment, said guide member having a vertically extending portion spaced from the forward wall of said housing, the spacing of said vertically extending portion being less opposite the closure of said compartment than at the side thereof toward which said closure is moved when being moved to inoperative position; and a horizontally extending portion on said guide member adapted for engaging the lower surface of said closure for said lower compartment and spaced along its edge slightly from the forward wall of said housing.

(5. A heat-treating furnace comprising a housing; a horizontally extending partition 7 for dividing said housing into a pair of chambers, the lower of said chambers being smaller than the upper and said partition projecting beyond the forward wall of said housing, said chambers communicating at the sides thereof through recesses formed in the side walls; a fuel delivery pipe projecting through opposite side walls of said lower chamber for delivering fuel into said recesses, each of said chambers being provided with an opening for the deposits of material therein; a sliding closure for each of said openings, the upper surface of the closure for said lower chamber and the lower surface of the closure for said upper chamber engaging the lower and upper surfaces of said projecting portion of said partition wall.

In testimony whereof I have signed the foregoing specification.

HENRY HALVORSEN. 

